I think I have expired my 15 attempts to answer B1 (it says so in 'Progress'). However, the little dots/circles, that I assume are supposed to mark off each incorrect answer, don't work. ie, I reached 15 incorrect answers without warning.

Is this a glitch?

Secondly, when I put in an answer to B1 (which I'm 100% sure I've figured out now (can i PM my answer to someone to see if it is correct?)) I keep getting directed to a page that says:

"OOPS!

It would appear that you have been trying to access part of a contest that is not available to you.

To prevent yourself from seeing this screen again, we recommend that
you do not tamper with the url, and only follow those links provided.

If you think you have seen this message when doing just that, please pm one of the admins.

Your IP address is: ............

This incident has been logged.

The Admin Team"

Is this what they mean by 'Locked Out' or have I made some kind of mistake???

The "little dots" don't disappear. They turn solid. Furthermore the last three are red instead of brown to show show are approaching the limit.

The warning screen you quote appears as a result of trying to tamper with the URL to bypass being frozen out, and - as a word of caution - it automagically ban you if you abuse it !

It does record your IP (and everything else you are trying to do) and, for what it's worth, I can confirm that what you think is the right answer (ie: the one you tried to force several times) is incorrect.

I suggest you just wait till the time limit passes and the submit box reappears... then pay close attention to the "little dots"

as for the URL thing, I haven't tampered with it... I dont know why its taking me to that page.

It's taking you to that page because you are tampering with the URL

At present, if you follow the links to the puzzle (selecting "Labyrinth2" from the home page is the easiest way) you will see that beneath it, where the submit box used to be, is a message stating that you are frozen out, and the time at which you will be "unfrozen".

At the time of this post you still have about two hours remaining. Only then will your submit box reappear so that you can continue entering guesses.

Edit: I should add that you'll get the same warning when you try to bypass the puzzle you are locked out of, and access a later one.